Screwdriver bit



FIG. 1 is a perspective view of a screwdriver bit showing my new design;

FIG. 2 is a front elevational view thereof, a rear elevational view being identical;

FIG. 3 is a left side elevational view thereof;

FIG. 4 is a right side elevational view thereof; and,

FIG. 5 is a top plan view thereof, a bottom plan view being identical.

The broken lines are shown for illustrative purposes only and form no part of claimed design. 

CLAIM The ornamental design for a screwdriver bit, as shown and described. 